Pump



Oct. 30, 1928.

J. M. M CLATCHIE PUMP Filed Nov. 2E), 1926 l y ///u//fl y M W mu 2 v 7 I II l -1: 5x? 3 AM 3 3 W E M N I ATTORNE Patented Oct. 30, 1928.

UNITED ,s rnras E -PA ENT OFFICE, if;

JOHN MQMGGLATGHIE, or NEW YORK, s11, same: mm 303mm contramr; or .v

' newsman, n. Y., A cearons-rronernnw :mnsmr.

' ya linatimmee simmer 29,510. enmumamac a The invention relates-to an improvement in pumps, and more particularly to improve ment in pumps of the gear type.

1 Pumps of this type usually comprise a casingin which is-located a pair of intermeshing gears the teetlrof which serve as ithe ipumping member. These pumps have foundihighly eflicient for the purpose of withdrawing liquid from astorage-tank or the likeand deliveringit to'a point at which it-is toibezacted on. The pumpsof'thistype asheretoforeconstructed', however, ;have proven obj eotiouazble for pumping milk, Owing to .thefact that milk .sours quickly, the fibrous ,packings withv which these pumps have-"been provided have had to bereplaced daily, I an operation involving expense and delay. The objectof the present invention is to produce a gear pump of such constructio-nthat the necessity for fiber packings is eliminated, so that the pump may be cleaned without disassembling; or if disassembling is required, it may be done with a minimum of difficulty and time con sumption because of the simplicity of construction of the pump. To this end the invention consists in the improved pump of the gear type hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings illustrating the preferred formtof the invention, Fig. 1 is a longitudinal section through the im proved pump; and'Fig; 2 is a transverse section, on a reduced scale, taken along the line 22 of Fig. 1. V

The improved pump as illustrated in the drawings comprises two equal size intermeshing gears 5 and 6 enclosed within the casing 7 provided on its front side with the cover 8. The upper gear 5 is mounted on a shaft 9 j ournaled at one end in the pocket 10 formed in the casing and at the other end in the pocket 11' formed in the cover 8. The lower gear 6 i is secured by a key 12 to a cup-like hub part 1 1 of a shaft 16 ournaled at its forward end in the casing and cover and at its rear end in the journal block 17 The casing 7 and journal block 17 are connected togethed and supported from a base or frame 18; The shaft 16 is driven by means of the gear 19 and the direction of rotation is such that the milk or other fluid is drawn into the inlet 20 p of the casing to discharge through the out- The Shaft 16 is jointed a the ome; to facilitate the disassembling of the pump withoutd-isturbing thegear '19.

Since the gear 35 and the shaft :9 are entirely enclosed by the casing i7 and cover 8 it is unnecessany to provide them with washers to prevent leakage. Inasmuch, however, as thezshalft16kof the gear-6 projects through the casing it is necessary to provide packing means .at this point to prevent leakage. This packing means must be so arranged that, the pump may be quickly disassembled and assembled again if :necessar, or that is not considered desirable, mustofsuch anature that milk willenotiadheretoii't sour. In 7 the arrangement shownI interpose between the disk part .or bottom 250i .the hub 141L116 the adjacent part 2.6 of {the :a metal washer27. The disk part 25 ofthehub 141s pressed tightly against the washer 27 and the latter against the adjacent part 26 of the casing by means of the expansion spring 28 located within the circumferential recess 29 of the hub 14,0ne end of the spring bearing againstthe disk 25 and the other end of the spring bearing against a washer 30 which snugly surrounds the outer end of the shaft 17 and is forced by the spring 80 against the adjacent part 31 of the cover 8. The washer 30 fits within a recess 32 in the outer end of the hub 14.

" The washers 27 and 30 are preferably made of hardened metal so that they may be ground to assure perfect alinement and therefore a tlght joint at the point where the washer 27' is interposed between the disk 25 and the adjacent part 26 of the casing. In order to facilitate the disassembling of the pump; parts the spline 12 is fitted tightly into either the l v p gear 6 or hub 14 andhas a sliding connection with the other member.

Having thus described the invention what I claim as new is v 1. A pump of the class described comprising, a casing havingan inlet and an outlet, a

ing, a shaft for the first gear journaled within the casing, a shaft for the second gear jourpair of inter-meshing gears located in the casa metal washer interposed between one end i of the hub and the adjacent part of the easing, a second metal washer interposed between tween. the disk part of the hub and the adjathe other end of ,the hub and the adjacent one end against thelhub to force thefirst Washer against the adjacent part of the casing and pressing at the other end against the second Washer.

2. A pump of the class described compris ing, a casing having an inlet and an outlet, a pair of intermeshing gears mounted in the casing, a driving shaft for one of the gears projecting through" the casing, a cup-shaped hub 0n the driving shaft for supporting the second gear, a metal washer interposed becent part of the casing, and a spring received Within'the cup-shaped hub and pressing at one end against the disk part of the hub and at the other end against the opposite Wall of the casing. i

i Afpump of the class described comprising, a casing having an inlet and an outlet, a pair of internieshing gears mounted in the casing, a shaft for one of the gears projecting through the casing, an enlargement on the shaft for supporting the second gear, washer interposed between the enlargement Casing;

and the adjacent part of the casing and means for resiliently forcing the enlargement against the Washerand the latter against the 4 A pum of therclass described coInprising, a casing having aninlet and an outlet, a pair of intermeshing gears located in the casing, said gears being of substantially v the same thicknessas the depth of the chamber, a shaft for the first gear journaled in the side Walls of'thij casing, a shaft forthesec- 0nd gear journaled in the sidewalls of the casing and extend ng at one end through one of the Walls, means for-driving the second shaft, a cup-shaped hub formed onthe sec- 0nd shaft and onwhich the second gear is mounted, a metal Washer of substantially the same diameter as the hub interposed between the outer side of the bottom end of the hub and the'adjacent Wall'of the-casing, a second Washer slidingly received Withinthe free end of the hub, and a spring located Within" the hub and acting on the second Washer-to rforce against the adjacent Wall o f tli'e easing and .on'the bottom of the hub to force the first Washer against theadjacent wallof 

